[KLUG Members] Mirroring in Ubuntu 7.04 Server.

[Jason Edward Durrett]

Hi Chris,

The easy way is to do it when you are installing the system.  Here are 
my notes from setting up raid with Debian several years ago.  You will 
probably need to get to an advanced set up in order to find these options:

First, create a primary partition on each of the disks. Use the entire 
disk and erase its contents. Now, on each disk, IDE0 and IDE1, create an 
identical partion scheme setting each partion to the type of RAID 
device. Using the typical linux partition scheme, we get something like 
this:
IDE0:
/ 250MB RAID
 / 500GB RAID
 / 4GB RAID
 / 1.5GB RAID
 / 400MB RAID
 / 10GB RAID
IDE2:
/ 250MB RAID
 / 500GB RAID
 / 4GB RAID
 / 1.5GB RAID
 / 400MB RAID
 / 10GB RAID
Now, the RAID devices need to be set up. Choose the menu option for 
setting up RAID device. Select type of RAID1 with 2 active devices and 0 
inactive devices. Match Part1 on IDE0 with Part1 on IDE1. Do this with 
the remaining partitions.
The last step is setting up the File System on the RAID devices. Set the 
first RAID device to EXT3 mounted on / and continue for /usr /var /tmp 
/swap /home. Note, the swap device should be set to type swap and not ext3.
After this step, the installer takes over and begins installing the base 
system.

The root partition may not have raid enabled on reboot. To enable it, type:
#mdadmin -a /dev/md0
To fix this problem, first be sure all the partitions are running properly:
# cat /proc/mdstat
Then, run mkinitrd (run automatically if you choose this time to do a 
kernel upgrade).
A proper configuration should look like this:
zues:~# cat /proc/mdstat
 Personalities : [raid1]
 md1 : active raid1 hda5[0] hdb5[1]
 4883648 blocks [2/2] [UU]
md2 : active raid1 hda6[0] hdb6[1]
 2931712 blocks [2/2] [UU]
md3 : active raid1 hda7[0] hdb7[1]
 1453760 blocks [2/2] [UU]
md5 : active raid1 hda9[0] hdb9[1]
 10000320 blocks [2/2] [UU]
md0 : active raid1 hda1[0] hdb1[1]
 272960 blocks [2/2] [UU]
md4 : active raid1 hda8[0] hdb8[1]
 393472 blocks [2/2] [UU]
unused devices:
 zues:~#










wilky wrote:
>    I have what is probably a simple question. /i hope
>
> OK I am looking into running an Ubuntu 7.04 server as a web server. I 
> have 2 IDE hard drive in this pc and here is my question.
>
> How do i go about mirroring this system. i would like to install the 
> OS on the mirror. there is no room in this case for another hard drive 
> so I am stuck with 2 drives.
> I have googled this and the few walk troughs i did find did not work.
> Hopefully it will be KLUG too the rescue :)
>
> PC SPECS:
> P3 1.2gh
> 512 PC133 SDRAM
> 2 x 20GB Seagate hard disks. both IDE one on IDE channel 1 the other 
> on IDE channel 2.
> Attempted OS: Ubuntu Server 7.04 Command line only.
>
> Thanks in advance,
> Chris
>
>
> -- 
> "I have not failed. I've just found 10,000 ways that won't work."
> - Thomas Alva Edison (1847-1931)
> ------------------------------------------------------------------------
>
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